EP0587926A1 - Fuel rod for nuclear reactor and welding device for its manufacture - Google Patents

Fuel rod for nuclear reactor and welding device for its manufacture Download PDF

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Publication number
EP0587926A1
EP0587926A1 EP92115717A EP92115717A EP0587926A1 EP 0587926 A1 EP0587926 A1 EP 0587926A1 EP 92115717 A EP92115717 A EP 92115717A EP 92115717 A EP92115717 A EP 92115717A EP 0587926 A1 EP0587926 A1 EP 0587926A1
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EP
European Patent Office
Prior art keywords
cladding tube
fuel rod
annular bead
sealing plug
rod according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92115717A
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German (de)
French (fr)
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EP0587926B1 (en
Inventor
Dieter Credé
Rainer Schleich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to ES92115717T priority Critical patent/ES2090440T3/en
Priority to EP92115717A priority patent/EP0587926B1/en
Priority to DE59206825T priority patent/DE59206825D1/en
Priority to US08/120,124 priority patent/US6104773A/en
Priority to JP5250057A priority patent/JPH06194474A/en
Publication of EP0587926A1 publication Critical patent/EP0587926A1/en
Priority to US08/353,659 priority patent/US5513230A/en
Application granted granted Critical
Publication of EP0587926B1 publication Critical patent/EP0587926B1/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/30—Features relating to electrodes
    • B23K11/3009—Pressure electrodes
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/02—Fuel elements
    • G21C3/04—Constructional details
    • G21C3/06—Casings; Jackets
    • G21C3/10—End closures ; Means for tight mounting therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to a fuel rod according to the preamble of claim 1 and a welding device for producing this fuel rod.
  • Such a fuel rod is already common. Its ring bead has a sharp annular degree, i.e. the cross section of the ring bead forms an acute-angled triangle with an acute angle, which is located at the annular degree.
  • Such a fuel rod can be produced in a welding device with an electrode in which there is a bore for receiving a cladding tube end.
  • This bore is chamfered at an end of the bore, which faces a counterelectrode which is displaceable relative to this electrode and is intended for holding the sealing plug, with the formation of a frustoconical cavity which tapers inwards.
  • the frustoconical cavity determines the shape of the toroidal ring formed from solidified welding melt when the sealing plug is welded to the cladding tube.
  • the welded connection between the cladding tube and the sealing plug is considered to be perfect if the truncated cone-shaped cavity of the electrode for the cladding tube is filled with the material of the cladding tube and the sealing plug during welding to a certain extent, which can be determined by experiment. After welding can be done by measuring the level of the level of the ring bead at the weld Plug and cladding tube of the fuel rod the quality of this weld can be determined.
  • the fuel rods must be threaded into the meshes of spacers, which are generally lattice-shaped.
  • the annular bead at the weld between the cladding tube and the sealing plug of the individual fuel rods is a hindrance. This is why these ring beads are mechanically processed after measuring and determining the quality of the weld, e.g. milled until it can be assumed that they no longer hinder the threading of the fuel rods into the spacers.
  • the invention has for its object to eliminate the mechanical processing operation.
  • a fuel rod of the type mentioned at the outset has the features of the characterizing part of patent claim 1.
  • the outer diameter of the cylindrical outer surface of the annular bead can be chosen from the outset in such a way that the fuel rod in question can be threaded into cells of spacers without mechanical reworking of the annular bead.
  • a statement can be made about the quality of the welded connection between the cladding tube and the sealing plug of the fuel rod in question due to the relative feed between the electrode with the cladding tube and the counter electrode with the sealing plug when these parts are welded together.
  • a fuel rod according to the invention can be produced easily and inexpensively.
  • the welding device shows a copper electrode 2 composed of two identical halves with a through hole 3 in which there is a cladding tube 4 made of a zirconium alloy of a fuel rod and filled with nuclear fuel.
  • the two identically designed parts of the copper electrode 2 enclose the cladding tube 4 located in the through hole 3 and touch the outer surface of this cladding tube 4 over a large area.
  • a plug 8 is also in this copper sleeve 7 made of a zirconium alloy used loose for the fuel rod.
  • the through hole 3 is provided at its end facing the copper sleeve 7 with a cylindrical step 9 with a diameter larger than the hole diameter of the through hole 3.
  • this step 9 which forms a cylindrical cavity, the end of the cladding tube 4 and at one end protrudes the other end, the end of the plug 8.
  • dash-dotted lines represent the original shape of the cladding tube 4 and plug 8.
  • the sealing plug 8 forms an outer cone 10 on the end face, which tapers towards the longitudinal axis 5 of the cladding tube and thus also towards the longitudinal axis 5 of the sealing plug 8 falling into this longitudinal axis 5.
  • One end of the cladding tube 4 lies against the cone 10 with its inner edge.
  • an electrical power source is connected to the copper electrode 2 and to the copper sleeve 7.
  • the sealing plug 8 is pressed against the cladding tube 4 with the carrier body 6 and the material is compressed around the feed 11 (compression path) at the point of contact of the sealing plug 8 and cladding tube 4.
  • the sealing plug 8 engages in the cladding tube 4, and at the transition point between the cladding tube 4 and the sealing plug 8, an annular bead 12 with a cylindrical outer jacket surface 13 is present on the outer surface of the cladding tube 4.
  • An annular material extrusion 14 is formed within the cladding tube 4. Both the annular bead 12 and the material extrusion 14 are composed of the material of the original cladding tube and the original sealing plug, in the present case made of zirconium alloy.
  • trough 15 that runs around the longitudinal axis 5 of the cladding tube 4 in the cylindrical outer surface 13 of the annular bead 12.
  • This trough 15 contains the material, ie the zirconium alloy of the cladding tube 4 with the same structure as in FIG Cladding tube 4.
  • An inner coating 16 made of high-purity zirconium can be seen on the inside of the cladding tube 4. This corrosion-sensitive coating continues on the surface of the material extrusion 14 and has not penetrated into the material solidified from the welding melt and thus has not penetrated to the outside.
  • the cylindrical outer lateral surface 13 of the annular bead 12 can remain mechanically unprocessed. This not only saves manufacturing costs, but also prevents damage to the cladding tube 4 on the annular bead 12. Machining chips are also avoided, which could even easily ignite in the case of a zirconium alloy.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

A fuel rod for a nuclear reactor has a cladding tube (4) of metal with a closure plug (8) of metal welded onto one end of the tube; on the outer surface of the cladding tube (4) there is at the transition between cladding tube (4) and closure plug (8) an annular bead (12) with a cylindrical outer lateral surface (13), which has generating lines which are substantially parallel to the longitudinal axis (5) of the cladding tube (4). <IMAGE>

Description

Die Erfindung betrifft einen Brennstab entsprechend dem Oberbegriff des Patentanspruchs 1 und eine Schweißvorrichtung zum Herstellen dieses Brennstabs.The invention relates to a fuel rod according to the preamble of claim 1 and a welding device for producing this fuel rod.

Ein solcher Brennstab ist bereits üblich. Sein Ringwulst hat einen scharfen ringförmigen Grad, d.h. der Querschnitt des Ringwulsts bildet ein spitzwinkliges Dreieck mit einem spitzen Winkel, der sich am ringförmigen Grad befindet.Such a fuel rod is already common. Its ring bead has a sharp annular degree, i.e. the cross section of the ring bead forms an acute-angled triangle with an acute angle, which is located at the annular degree.

Ein solcher Brennstab kann in einer Schweißvorrichtung hergestellt werden mit einer Elektrode, in der sich eine Bohrung zur Aufnahme eines Hüllrohrendes befindet. Diese Bohrung ist an einem Bohrungsende, das einer relativ zu dieser Elektrode verschiebbaren, zum Halten des Verschlußstopfens bestimmten Gegenelektrode zugewandt ist, unter Ausbildung eines kegelstumpfförmigen, sich nach innen verjüngenden Hohlraums angefast. Der kegelstumpförmige Hohlraum bestimmt die Form des sich beim Festschweißen des Verschlußstopfens am Hüllrohr ausbildenden Ringwulsts aus erstarrter Schweißschmelze.Such a fuel rod can be produced in a welding device with an electrode in which there is a bore for receiving a cladding tube end. This bore is chamfered at an end of the bore, which faces a counterelectrode which is displaceable relative to this electrode and is intended for holding the sealing plug, with the formation of a frustoconical cavity which tapers inwards. The frustoconical cavity determines the shape of the toroidal ring formed from solidified welding melt when the sealing plug is welded to the cladding tube.

Die Schweißverbindung zwischen Hüllrohr und Verschlußstopfen gilt als einwandfrei, wenn der kegelstumpfförmige Hohlraum der Elektrode für das Hüllrohr beim Schweißen bis zu einem bestimmten, durch Versuche ermittelbaren Umfang mit Werkstoff des Hüllrohrs und des Verschlußstopfens aufgefüllt wird. Nach dem Schweißen kann durch Messen der Höhe des Grads des Ringwulsts an der Schweißstelle zwischen Verschlußstopfen und Hüllrohr des Brennstabs die Qualität dieser Schweißstelle festgestellt werden.The welded connection between the cladding tube and the sealing plug is considered to be perfect if the truncated cone-shaped cavity of the electrode for the cladding tube is filled with the material of the cladding tube and the sealing plug during welding to a certain extent, which can be determined by experiment. After welding can be done by measuring the level of the level of the ring bead at the weld Plug and cladding tube of the fuel rod the quality of this weld can be determined.

Zum Herstellen von Kernreaktorbrennelementen, die in einem Kernreaktor einsetzbar sind, müssen die Brennstäbe in die Maschen von in der Regel gitterförmigen Abstandhaltern eingefädelt werden. Hierbei ist der Ringwulst an der Schweißstelle zwischen Hüllrohr und Verschlußstopfen der einzelnen Brennstäbe hinderlich. Deshalb werden diese Ringwulste nach dem Ausmessen und Feststellen der Qualität der Schweißstelle mechanisch abgearbeitet, z.B. abgefräst, bis davon ausgegangen werden kann, daß sie das Einfädeln der Brennstäbe in die Abstandhalter nicht mehr behindern.To produce nuclear reactor fuel elements that can be used in a nuclear reactor, the fuel rods must be threaded into the meshes of spacers, which are generally lattice-shaped. Here, the annular bead at the weld between the cladding tube and the sealing plug of the individual fuel rods is a hindrance. This is why these ring beads are mechanically processed after measuring and determining the quality of the weld, e.g. milled until it can be assumed that they no longer hinder the threading of the fuel rods into the spacers.

Bei diesem mechanischen Abarbeiten kann es zur Beschädigung des Hüllrohrs kommen, durch die ein Brennstab Ausschuß wird. Der Erfindung liegt die Aufgabe zugrunde, den Arbeitsgang des mechanischen Abarbeitens zu eliminieren.This mechanical processing can damage the cladding tube, through which a fuel rod is rejected. The invention has for its object to eliminate the mechanical processing operation.

Zur Lösung dieser Aufgabe hat ein Brennstab der eingangs erwähnten Art erfindungsgemäß die Merkmale des kennzeichnenden Teils des Patentanspruchs 1.To achieve this object, a fuel rod of the type mentioned at the outset has the features of the characterizing part of patent claim 1.

Der Außendurchmesser der zylinderförmigen Mantelfläche des Ringwulsts kann von vornherein so gewählt sein, daß ein Einfädeln des betreffenden Brennstabs in Zellen von Abstandhaltern ohne mechanische Nachbearbeitung des Ringwulsts möglich ist. Andererseits kann eine Aussage über die Qualität der Schweißverbindung zwischen Hüllrohr und Verschlußstopfen des betreffenden Brennstabes aufgrund des relativen Vorschubs zwischen der Elektrode mit dem Hüllrohr und der Gegenelektrode mit dem Verschlußstopfen beim Verschweißen dieser Teile miteinander getroffen werden.
   Mit einer Schweißvorrichtung entsprechend Patentanspruch 7 kann ein erfindungsgemäßer Brennstab einfach und kostengünstig hergestellt werden.The outer diameter of the cylindrical outer surface of the annular bead can be chosen from the outset in such a way that the fuel rod in question can be threaded into cells of spacers without mechanical reworking of the annular bead. On the other hand, a statement can be made about the quality of the welded connection between the cladding tube and the sealing plug of the fuel rod in question due to the relative feed between the electrode with the cladding tube and the counter electrode with the sealing plug when these parts are welded together.
With a welding device according to claim 7, a fuel rod according to the invention can be produced easily and inexpensively.

Die Erfindung und ihre Vorteile seien anhand der Zeichnung an einem Ausführungsbeispiel näher erläutert:

  • Figur 1 zeigt im Längsschnitt eine erfindungsgemäße Schweißvorrichtung zum Verschweißen von Hüllrohr und Verschlußstopfen eines erfindungsgemäßen Brennstabs.
  • Figur 2 zeigt im Längsschnitt den mit dem Hüllrohr verschweißten Verschlußstopfen des Brennstabs nach der Erfindung.
  • Figur 3 zeigt ein Schliffbild zum Längsschnitt nach Figur 2.
The invention and its advantages are explained in more detail with reference to the drawing using an exemplary embodiment:
  • FIG. 1 shows in longitudinal section a welding device according to the invention for welding the cladding tube and sealing plug of a fuel rod according to the invention.
  • Figure 2 shows in longitudinal section the sealing plug of the fuel rod welded to the cladding tube according to the invention.
  • FIG. 3 shows a micrograph for the longitudinal section according to FIG. 2.

Die Schweißvorrichtung nach Figur 1 zeigt eine aus zwei gleich ausgebildeten Hälften zusammengesetzte Kupferelektrode 2 mit einer Durchgangsbohrung 3, in der sich ein mit Kernbrennstoff gefülltes Hüllrohr 4 aus einer Zirkoniumlegierung eines Brennstabes befindet. Die beiden gleich ausgebildeten Teile der Kupferelektrode 2 umschließen das in der Durchgangsbohrung 3 befindliche Hüllrohr 4 und berühren die äußere Oberfläche dieses Hüllrohrs 4 großflächig.The welding device according to FIG. 1 shows a copper electrode 2 composed of two identical halves with a through hole 3 in which there is a cladding tube 4 made of a zirconium alloy of a fuel rod and filled with nuclear fuel. The two identically designed parts of the copper electrode 2 enclose the cladding tube 4 located in the through hole 3 and touch the outer surface of this cladding tube 4 over a large area.

Ferner ist ein relativ zur Kupferelektrode 2 in Richtung der Längsachse 5 des Hüllrohrs 4 verschiebbarer Trägerkörper 6 für eine Gegenelektrode vorgesehen, die aus einer zum Hüllrohr 4 und damit zur Durchführung 3 in der Kupferelektrode 2 koaxial angeordneten Kupferhülse 7 besteht. In diese Kupferhülse 7 ist ein Verschlußstopfen 8 ebenfalls aus einer Zirkoniumlegierung für den Brennstab lose eingesetzt.Furthermore, a support body 6, which is displaceable relative to the copper electrode 2 in the direction of the longitudinal axis 5 of the cladding tube 4, is provided for a counterelectrode, which consists of a copper sleeve 7 arranged coaxially with the cladding tube 4 and thus for the leadthrough 3 in the copper electrode 2. A plug 8 is also in this copper sleeve 7 made of a zirconium alloy used loose for the fuel rod.

Die Durchgangsbohrung 3 ist an ihrem der Kupferhülse 7 zugewandten Ende mit einer zylinderförmigen Abstufung 9 versehen mit einem Durchmesser größer als dem Bohrungsdurchmesser der Durchgangsbohrung 3. In diese Abstufung 9, die einen zylinderförmigen Hohlraum bildet, ragt an einem Ende das Ende des Hüllrohrs 4 und am anderen Ende das Ende des Verschlußstopfens 8 hinein.The through hole 3 is provided at its end facing the copper sleeve 7 with a cylindrical step 9 with a diameter larger than the hole diameter of the through hole 3. In this step 9, which forms a cylindrical cavity, the end of the cladding tube 4 and at one end protrudes the other end, the end of the plug 8.

In Figur 2 geben strichpunktierte Linien die ursprüngliche Form von Hüllrohr 4 und Verschlußstopfen 8 wieder. Der Verschlußstopfen 8 bildet in seiner ursprünglichen Form an der Stirnfläche einen Außenkonus 10, der sich zur Längsachse 5 des Hüllrohrs und damit auch zu der in diese Längsachse 5 fallende Längsachse des Verschlußstopfens 8 hin verjüngt. Ein Ende des Hüllrohrs 4 liegt mit seiner Innenkante am Konus 10 an.In Figure 2 dash-dotted lines represent the original shape of the cladding tube 4 and plug 8. In its original form, the sealing plug 8 forms an outer cone 10 on the end face, which tapers towards the longitudinal axis 5 of the cladding tube and thus also towards the longitudinal axis 5 of the sealing plug 8 falling into this longitudinal axis 5. One end of the cladding tube 4 lies against the cone 10 with its inner edge.

Zum Verschweißen des Hüllrohrs 4 mit dem Verschlußstopfen 8 wird eine elektrische Stromquelle an die Kupferelektrode 2 und an die Kupferhülse 7 angeschlossen. Zugleich wird mit dem Trägerkörper 6 der Verschlußstopfen 8 gegen das Hüllrohr 4 gepreßt und der Werkstoff an der Berührungsstelle von Verschlußstopfen 8 und Hüllrohr 4 um den Vorschub 11 (Stauchweg) gestaucht.To weld the cladding tube 4 to the sealing plug 8, an electrical power source is connected to the copper electrode 2 and to the copper sleeve 7. At the same time, the sealing plug 8 is pressed against the cladding tube 4 with the carrier body 6 and the material is compressed around the feed 11 (compression path) at the point of contact of the sealing plug 8 and cladding tube 4.

Während in Figur 1 oberhalb der strichpunktierten Längsachse 5 des Hüllrohrs 4 der Anfangszustand von Hüllrohr 4 und Verschlußstopfen 8 zu Beginn des Schweißvorgangs dargestellt ist, ist unterhalb dieser Längsachse 5 der Endzustand nach Beendigung des Schweißvorgangs und Abschalten der Kupferelektrode 2 und der Kupferhülse 7 von der Stromquelle erkennbar.While in Figure 1 above the dash-dotted longitudinal axis 5 of the cladding tube 4, the initial state of the cladding tube 4 and the sealing plug 8 is shown at the start of the welding process, below this longitudinal axis 5 is the final state after the welding process has been ended and switched off the copper electrode 2 and the copper sleeve 7 can be seen from the power source.

Wie Figur 2 zeigt, greift in diesem Endzustand der Verschlußstopfen 8 in das Hüllrohr 4, und an der Übergangsstelle zwischen Hüllrohr 4 und Verschlußstopfen 8 ist an der Außenoberfläche des Hüllrohrs 4 ein Ringwulst 12 mit einer zylinderförmigen äußeren Mantelfläche 13 vorhanden. Innerhalb des Hüllrohrs 4 ist eine ringförmige Werkstoffauspressung 14 ausgebildet. Sowohl Ringwulst 12 als auch die Werkstoffauspressung 14 sind aus dem Werkstoff des ursprünglichen Hüllrohrs und des ursprünglichen Verschlußstopfens, im vorliegenden Fall aus Zirkoniumlegierung zusammengesetzt.As shown in FIG. 2, in this final state, the sealing plug 8 engages in the cladding tube 4, and at the transition point between the cladding tube 4 and the sealing plug 8, an annular bead 12 with a cylindrical outer jacket surface 13 is present on the outer surface of the cladding tube 4. An annular material extrusion 14 is formed within the cladding tube 4. Both the annular bead 12 and the material extrusion 14 are composed of the material of the original cladding tube and the original sealing plug, in the present case made of zirconium alloy.

Infolge der beiden Fugen, die sich zwischen den beiden Teilen der Kupferelektrode 2 befinden, können sich auf der äußeren Mantelfläche 13 des Ringwulsts 12 zwei Überhöhungen befinden, die in Figur 2 nicht erkennbar sind und von denen sich jede längs einer Mantellinie der Mantelfläche 13 erstreckt.As a result of the two joints that are located between the two parts of the copper electrode 2, there may be two peaks on the outer lateral surface 13 of the annular bead 12, which cannot be seen in FIG. 2 and each of which extends along a surface line of the lateral surface 13.

Nicht nur der Ringwulst 12, sondern auch die Werkstoffauspressung 14 sind aus einer Schweißschmelze wieder erstarrt und haben die in Figur 3 dargestellte Gefügestruktur. Der Fluß des Werkstoffs durch das Schweißen ist mit den Pfeilen 16 angedeutet.Not only the annular bead 12, but also the material extrusion 14 have solidified again from a weld melt and have the structure shown in FIG. 3. The flow of the material through the welding is indicated by the arrows 16.

Wie Figur 3 entnommen werden kann, befindet sich in der zylinderförmigen Mantelfläche 13 des Ringwulsts 12 eine in bezug auf die Längsachse 5 des Hüllrohrs 4 umlaufende Mulde 15. Diese Mulde 15 enthält den Werkstoff, d.h. die Zirkoniumlegierung des Hüllrohrs 4 mit dem gleichen Gefüge wie im Hüllrohr 4.As can be seen in FIG. 3, there is a trough 15 that runs around the longitudinal axis 5 of the cladding tube 4 in the cylindrical outer surface 13 of the annular bead 12. This trough 15 contains the material, ie the zirconium alloy of the cladding tube 4 with the same structure as in FIG Cladding tube 4.

Innen am Hüllrohr 4 ist ein Innenüberzug 16 aus hochreinem Zirkonium erkennbar. Dieser korrosionsempfindliche Überzug setzt sich auf der Oberfläche der Werkstoffauspressung 14 fort und ist nicht in das aus der Schweißschmelze erstarrte Material und damit auch nicht nach außen vorgedrungen.An inner coating 16 made of high-purity zirconium can be seen on the inside of the cladding tube 4. This corrosion-sensitive coating continues on the surface of the material extrusion 14 and has not penetrated into the material solidified from the welding melt and thus has not penetrated to the outside.

Die zylinderförmige äußere Mantelfläche 13 des Ringwulsts 12 kann mechanisch unbearbeitet bleiben. Dadurch werden nicht nur Fertigungskosten eingespart, sondern auch eine Beschädigung des Hüllrohrs 4 am Ringwulst 12 vermieden. Ferner werden Bearbeitungsspäne vermieden, die sich im Falle einer Zirkoniumlegierung sogar sehr leicht selbst entzünden könnten.The cylindrical outer lateral surface 13 of the annular bead 12 can remain mechanically unprocessed. This not only saves manufacturing costs, but also prevents damage to the cladding tube 4 on the annular bead 12. Machining chips are also avoided, which could even easily ignite in the case of a zirconium alloy.

Claims (7)

Brennstab für einen Kernreaktor mit einem aus Metall bestehenden Hüllrohr (4), das mit Kernbrennstoff gefüllt und einen an einem Rohrende angeschweißten Verschlußstopfen (8) aus Metall, insbesondere aus dem gleichen Metall, sowie an der Außenoberfläche des Hüllrohrs (4) an der Übergangsstelle zwischen Hüllrohr (4) und Verschlußstopfen (8) einen Ringwulst (12) aufweist,
dadurch gekennzeichnet,
daß der Ringwulst (12) eine zylinderförmige äußere Mantelfläche (13) mit zur Längsachse (5) des Hüllrohrs (4) im wesentlichen parallelen Mantellinien hat.Fuel rod for a nuclear reactor with a cladding tube (4) made of metal, which is filled with nuclear fuel and a sealing plug (8) made of metal, in particular of the same metal, welded to one end of the tube, and on the outer surface of the cladding tube (4) at the transition point between The cladding tube (4) and sealing plug (8) has an annular bead (12),
characterized,
that the annular bead (12) has a cylindrical outer jacket surface (13) with jacket lines substantially parallel to the longitudinal axis (5) of the cladding tube (4). Brennstab nach Anspruch 1,
dadurch gekennzeichnet, daß der Ringwulst (12) auf der zylinderförmigen äußeren Mantelfläche (13) mindestens zwei Überhöhungen aufweist, von denen sich jede längs einer Mantellinie der Mantelfläche (13) erstreckt.Fuel rod according to claim 1,
characterized in that the annular bead (12) has at least two elevations on the cylindrical outer lateral surface (13), each of which extends along a surface line of the lateral surface (13). Brennstab nach Anspruch 1,
dadurch gekennzeichnet, daß der Werkstoff des Ringwulsts (12) aus dem Metall des Hüllrohrs (4) und des Verschlußstopfens (8) zusammengesetzt ist.Fuel rod according to claim 1,
characterized in that the material of the annular bead (12) is composed of the metal of the cladding tube (4) and the sealing plug (8). Brennstab nach Anspruch 1,
dadurch gekennzeichnet, daß der Ringwulst (12) aus einer Schweißschmelze wieder erstarrt ist.Fuel rod according to claim 1,
characterized in that the annular bead (12) has solidified again from a weld melt. Brennstab nach Anspruch 1,
dadurch gekennzeichnet, daß die zylinderförmige äußere Mantelfläche (13) des Ringwulsts (12) mechanisch unbearbeitet ist.Fuel rod according to claim 1,
characterized in that the cylindrical outer surface (13) of the annular bead (12) is mechanically unprocessed. Brennstab nach Anspruch 1,
dadurch gekennzeichnet, daß sich in der zylinderförmigen äußeren Mantelfläche (13) des Ringwulsts (12) eine umlaufende Mulde (15) im Ringwulst (12) befindet, die den Werkstoff des Hüllrohrs (4) mit dem gleichen Gefüge wie im Hüllrohr (4) enthält.Fuel rod according to claim 1,
characterized in that in the cylindrical outer lateral surface (13) of the annular bead (12) there is a circumferential trough (15) in the annular bead (12) which contains the material of the cladding tube (4) with the same structure as in the cladding tube (4) . Schweißvorrichtung zum Herstellen eines Brennstabs nach einem der Patentansprüche 1 bis 6 mit einer Elektrode (2), in der sich eine Durchgangsbohrung (3) zur Aufnahme eines Endes eines Hüllrohrs (4) befindet, sowie mit einem Ende der Durchgangsbohrung (3), das einer relativ zur Elektrode (2) verschiebbaren, zum Halten des Verschlußstopfens (8) bestimmten Gegenelektrode (7) zugewandt ist und das eine zylinderförmige Abstufung (9) mit einem Durchmesser größer als der Durchmesser der Durchgangsbohrung (3) aufweist.Welding device for producing a fuel rod according to one of the claims 1 to 6 with an electrode (2) in which there is a through hole (3) for receiving one end of a cladding tube (4), and with one end of the through hole (3), which is one counter electrode (7) which is displaceable relative to the electrode (2) and is intended for holding the sealing plug (8) and which has a cylindrical step (9) with a diameter larger than the diameter of the through hole (3).
EP92115717A 1992-09-14 1992-09-14 Fuel rod for nuclear reactor and welding device for its manufacture Expired - Lifetime EP0587926B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
ES92115717T ES2090440T3 (en) 1992-09-14 1992-09-14 FUEL BAR FOR A NUCLEAR REACTOR AND WELDING DEVICE FOR ITS MANUFACTURE.
EP92115717A EP0587926B1 (en) 1992-09-14 1992-09-14 Fuel rod for nuclear reactor and welding device for its manufacture
DE59206825T DE59206825D1 (en) 1992-09-14 1992-09-14 Fuel rod for a nuclear reactor and welding device for its manufacture
US08/120,124 US6104773A (en) 1992-09-14 1993-09-10 Fuel rod for a nuclear reactor
JP5250057A JPH06194474A (en) 1992-09-14 1993-09-10 Fuel rod of nuclear reactor
US08/353,659 US5513230A (en) 1992-09-14 1994-12-09 Fuel rod for a nuclear reactor and welding apparatus for producing the fuel rod

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP92115717A EP0587926B1 (en) 1992-09-14 1992-09-14 Fuel rod for nuclear reactor and welding device for its manufacture

Publications (2)

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EP0587926A1 true EP0587926A1 (en) 1994-03-23
EP0587926B1 EP0587926B1 (en) 1996-07-24

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US (2) US6104773A (en)
EP (1) EP0587926B1 (en)
JP (1) JPH06194474A (en)
DE (1) DE59206825D1 (en)
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Publication number Priority date Publication date Assignee Title
US9922731B2 (en) * 2012-04-17 2018-03-20 Bwxt Mpower, Inc. Resistance welding of an end cap for nuclear fuel rods
KR101406076B1 (en) * 2013-01-08 2014-06-13 한전원자력연료 주식회사 Automatic welding apparatus for an end plug of a nuclear fuel rod
RU2615961C1 (en) * 2015-11-26 2017-04-11 Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" Assembly of welded joint of fuel element jacket with plug made of high-chromium steel (versions)
US10410754B2 (en) 2016-10-11 2019-09-10 Bwxt Mpower, Inc. Resistance pressure weld for nuclear reactor fuel rod tube end plug
CN106735807A (en) * 2016-12-28 2017-05-31 中核北方核燃料元件有限公司 A kind of new zirconium alloy fuel rod upset is molded soldering method
KR101923394B1 (en) 2017-01-12 2018-11-29 한전원자력연료 주식회사 Welding apparatus for producing a fuel rod

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GB1419838A (en) * 1972-03-30 1975-12-31 Belgonucleaire Sa Method for closing a nuclear fuel rod
US3959058A (en) * 1974-11-08 1976-05-25 Plastronics, Inc. Method and apparatus for butt-welding tubular plastic members to each other
EP0344528A2 (en) * 1988-06-02 1989-12-06 Westinghouse Electric Corporation Apparatus for welding an end plug of a burnable neutronsabsorber rod with a reduced diameter trailing shoulder to a tube.

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DE2550079A1 (en) * 1975-11-07 1977-05-12 Kraftwerk Union Ag METHOD OF CONNECTING FUEL END CAPS AND FUEL TUBES
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US4609805A (en) * 1985-07-12 1986-09-02 Toyota Jidosha Kabushiki Kaisha Weld nut welding apparatus
JPH01165988A (en) * 1987-12-22 1989-06-29 Nippon Nuclear Fuel Dev Co Ltd Fuel rod for nuclear reactor
JPH02176598A (en) * 1988-12-28 1990-07-09 Nuclear Fuel Ind Ltd Fuel rod for nuclear reactor

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GB1419838A (en) * 1972-03-30 1975-12-31 Belgonucleaire Sa Method for closing a nuclear fuel rod
US3959058A (en) * 1974-11-08 1976-05-25 Plastronics, Inc. Method and apparatus for butt-welding tubular plastic members to each other
EP0344528A2 (en) * 1988-06-02 1989-12-06 Westinghouse Electric Corporation Apparatus for welding an end plug of a burnable neutronsabsorber rod with a reduced diameter trailing shoulder to a tube.

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Title
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PATENT ABSTRACTS OF JAPAN vol. 14, no. 445 (P-1110)25. September 1990 & JP-A-02 176 598 ( NUCLEAR FUEL IND ) 9. Juli 1990 *

Also Published As

Publication number Publication date
EP0587926B1 (en) 1996-07-24
US6104773A (en) 2000-08-15
US5513230A (en) 1996-04-30
ES2090440T3 (en) 1996-10-16
JPH06194474A (en) 1994-07-15
DE59206825D1 (en) 1996-08-29

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